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US 8,963,104 B2Granted
Optical element for correcting color blindness
AssigneeNitto Denko Corporation
InventorsBrett T. Harding, Sheng Li, Amane Mochizuki
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Abstract
Devices having an optical element with a luminescent compound dispersed in a matrix material can be used for improving color discernment. Compositions and methods related to preparing and using these devices are also detailed in this disclosure.
Claims25
A device for improving ability to distinguish colors comprising:
- an optical element comprising a luminescent compound dispersed in a matrix material;
- wherein the optical element is sufficiently transparent to allow a person to see through the optical element;
- wherein the luminescent compound absorbs light at a visible absorption wavelength and emits light at a visible emission wavelength that is longer than the absorption wavelength, wherein a human cone photopigment is substantially more sensitive to the visible emission wavelength than to the visible absorption wavelength;
- wherein the optical element has a transmittance that is greater than 90% at the visible emission wavelength;
- and
- wherein the device is configured so that a person can better distinguish the colors by viewing an image or an object comprising the colors through the optical element.
3 more elements
A method for preparing a device for improving ability to distinguish colors comprising:
- incorporating a luminescent compound into an optical element;
- wherein the optical element configured to convert a color having a first set of color coordinates to a color having a second set of color coordinates by absorption and emission of visible light;
- wherein the luminescent compound is selected so that the distance between the first set of color coordinates and the second set of color coordinates in the direction normal to a deuteronopia color confusion line nearest to the first set of color coordinates is at least about 0.02 color coordinate units.
Dependencies are inferred from the claim text.